A convenient synthesis of coumarin-3-carboxylic acids via Knoevenagel condensation of Meldrum's acid with ortho-hydroxyaryl aldehydes or ketones

Aimin Song, Xiaobing Wang, Kit Lam

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Coumarin-3-carboxylic acids were obtained in high yields with excellent purity from ortho-hydroxybenzaldehydes and Meldrum's acid after a 2 h reflux in ethanol. The less reactive ketones were first reacted with alcoholic ammonia to form ketimines, which were then condensed with Meldrum's acid to generate 4-alkylcoumarin-3-carboxylic acids in moderate yields.

Original languageEnglish (US)
Pages (from-to)1755-1758
Number of pages4
JournalTetrahedron Letters
Issue number9
StatePublished - Feb 24 2003



  • Coumarin-3-carboxylic acids
  • Knoevenagel condensation
  • Meldrum's acid

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Drug Discovery

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